Near-field second-harmonic generation induced by local field enhancement

被引：584

作者：

Bouhelier, A ^{[1
]}

Beversluis, M ^{[1
]}

Hartschuh, A ^{[1
]}

Novotny, L ^{[1
]}

机构：

[1] Univ Rochester, Inst Opt, Rochester, NY 14627 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.90.013903

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The field near a sharp metal tip can be strongly enhanced if irradiated with an optical field polarized along the tip axis. We demonstrate that the enhanced field gives rise to local second-harmonic (SH) generation at the tip surface thereby creating a highly confined photon source. A theoretical model for the excitation and emission of SH radiation at the tip is developed and it is found that this source can be represented by a single on-axis oscillating dipole. The model is experimentally verified by imaging the spatial field distribution of strongly focused laser modes.

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页数：4

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